Interface GridEnvelope

Provides the grid coordinate values for the diametrically opposed
corners of the grid.

Remark that both corners are inclusive. Thus the number of elements in the direction of the first
axis is getHigh(0) - getLow(0) + 1.
This is the opposite of Java2D usage where maximal values in Rectangle (as computed by
getMaxX() and getMaxY()) are
exclusive.